When (and Why) you should file the natural nail from the underside.
Let's talk about one of the most misunderstood steps in nail prep — underside filing of the natural nail.
No, it's not "extra." It's smart technique that can make a real difference in your sets.
Here's what you need to know:
1. Why We File from the Underside
Underside filing isn't just about shape — it's a key method for:
- Removing weak, damaged areas of the free edge:
- Preventing future lifting or cracking;
- Extending the wear and durability of your product.
2. When It's Absolutely Necessary
Reach for your e-file if you notice:
- A damaged, thin, dehydrated, or very soft free edge - leaving it untouched often leads to lifting;
- Curved or hooked nails that grow downward;
- Twisted or uneven sidewalls (aka pincer nails or asymmetrical growth).
In these cases, filing from underneath helps relieve tension and creates a stronger, more stable structure.
3. When to Skip It
If the nail is:
- Healthy, firm, and grows straight
- Free from past lifting or breakage
- Being treated with soft products only (like gentle overlays or a gel polish manicure without added structure)
Bottom line, underside filing isn’t about doing “extra work,” it’s about doing smart work. When used intentionally, it can save you from future lifting, help your sets last longer, and give your client’s nails the strong, balanced structure they deserve. Know when to reach for it, when to skip it, and you’ll add another pro-level tool to your nail prep arsenal.
